Discover the groundbreaking insights into Jeune Asphyxiating Thoracic Dystrophy through Whole-Exome Sequencing, revealing DYNC2H1 mutations as a pivotal cause without affecting extra-skeletal organs.
– by Marv
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Whole-Exome Sequencing Identifies DYNC2H1 Mutations as a Cause of Jeune Asphyxiating Thoracic Dystrophy Without Extra-Skeletal Organ Involvement.
Asseri et al., Int Med Case Rep J 2024
<!– DOI: 10.2147/IMCRJ.S447466 //–>
https://doi.org/10.2147/IMCRJ.S447466
Oh, what a joyous day in the world of rare genetic disorders! We’ve stumbled upon a case of Jeune syndrome, also known as asphyxiating thoracic dystrophy (JATD), which is just as cheerful as it sounds. This condition, which sounds like it was named by someone who really wanted to emphasize how dire it is, primarily messes with cartilage and bone development. But wait, there’s more! This particular tale involves a patient with a “lethal form” of SRTD3, sans the extra fingers or toes (because, apparently, JATD wanted to keep things simple).
Our story begins with a full-term boy born to parents who are first-degree cousins (because who needs genetic diversity, right?). The mother, a 30-year-old with hypothyroidism, was probably hoping for a less eventful medical history for her child. Alas, fetal ultrasound showed that all long bones and ribs were playing hide and seek, hiding below the 1% percentile. The femur was not only shy but also decided to take on a curved shape, just for kicks. Despite these alarming signs, the baby’s head and abdominal circumference were chilling within the normal range.
But wait, the plot thickens on the 2nd day of life with the appearance of severe pulmonary hypertension (PHTN). Enter nitric oxide, the hero we didn’t know we needed, trying to combat persistent hypoxia and severe PHTN. Despite the valiant efforts, our little patient needed high cardiorespiratory support, and things went south, leading to respiratory failure. Tragically, at the tender age of 16 days, the baby succumbed to respiratory failure, courtesy of a severely restricted thoracic cage.
In a twist that surprises absolutely no one, whole-exome sequencing (WES) revealed a homozygous mutation in the DYNC2H1 gene. This mutation decided to swap an arginine codon at position 3014 with an isoleucine codon, because why not add a little variety? This confirmed the diagnosis of short-rib thoracic dysplasia-3 without polydactyly, because, in the world of genetic disorders, specificity is key.
In conclusion, our patient had isolated skeletal anomalies, decided polydactyly was too mainstream, and also had severe PHTN just to spice things up. The takeaway? There’s “considerably more work” needed to understand JATD and its genetic heterogeneity. Because, of course, the world of rare genetic disorders is never straightforward, and why make things easy when you can make them complicated?